105 results about "Congestion control algorithm" patented technology

A Weighted Random Early Detection (WRED) algorithm is described. The WRED algorithm provides fairness to responsive TCP and non-responsive UDP traffic at a buffer of a communications system. Because TCP traffic is responsive to congestion occurrences while UDP traffic is not, without controls, UDP will monopolize the buffer bandwidth. This invention solves the problem by applying congestion control alogrithms to TCP and UDP traffic separately. Discard thresholds for UDP traffic are dynamically modified in a manner that limits UDP traffic to a provisioned percentage of the buffer's available bandwidth, while a traditional WRED algorithm is applied to TCP traffic.

A pipelined linecard architecture for receiving, modifying, switching, buffering, queuing and dequeuing packets for transmission in a communications network. The linecard has two paths: the receive path, which carries packets into the switch device from the network, and the transmit path, which carries packets from the switch to the network. In the receive path, received packets are processed and switched in an asynchronous, multi-stage pipeline utilizing programmable data structures for fast table lookup and linked list traversal. The pipelined switch operates on several packets in parallel while determining each packet's routing destination. Once that determination is made, each packet is modified to contain new routing information as well as additional header data to help speed it through the switch. Each packet is then buffered and enqueued for transmission over the switching fabric to the linecard attached to the proper destination port. The destination linecard may be the same physical linecard as that receiving the inbound packet or a different physical linecard. The transmit path consists of a buffer / queuing circuit similar to that used in the receive path. Both enqueuing and dequeuing of packets is accomplished using CoS-based decision making apparatus and congestion avoidance and dequeue management hardware. The architecture of the present invention has the advantages of high throughput and the ability to rapidly implement new features and capabilities.

The invention discloses a satellite network congestion control method based on bandwidth estimation, comprising the following steps: S1: establishing a network transmission link; S2: using the Hybla-BE congestion control algorithm for data communication; S3: the TCP sending end of the ground station 1 Calculate the estimated bandwidth according to the receiving frequency of the received ACK; S4: Calculate the expected bandwidth; S5: Calculate the remaining bandwidth of the communication network, the congestion window growth factor ρcurrent of the Hybla algorithm, and the congestion window growth factor ρnew of the Hybla-BE algorithm; S6: According to The adjusted window growth factor ρnew adjusts the congestion window value; S7: Adjusts the congestion window value: the TCP sending end of ground station I predicts the bandwidth environment of the network by dynamically estimating the bandwidth value, and scales and adjusts the window growth factor according to the remaining bandwidth to achieve congestion The growth of the window value can dynamically adapt to the network bandwidth condition.

A source host comprising a processing resource that supports a kernel space and a user space. A socket layer is supported by the kernel space and allows a measurement application residing in the user space to instruct a protocol layer to form a plurality of UDP test packets for transmission, from the source host, to a destination node in a communications network. The plurality of test packets employ source-based routing and an alternative congestion control algorithm is implemented by the protocol layer to that supported by the communications network.